no problem,ess55. need more pics i'll send some. which mount point are you trying to use on the tub? the lower one? you can drill through, put a large fender washer on the inside and outside for stiffeners. bolts and nylon self locking nuts and yer good to go.
TREAT EVERY STRESSFUL SITUATION AS A DOG WOULD.
IF YOU CAN'T EAT IT OR PLAY WITH IT,
JUST PEE ON IT AND WALK AWAY.